JP2015010629A - Electromagnetic drive valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic drive valve having a simple structure and capable of preventing leakage of fluid.SOLUTION: An electromagnetic drive valve comprises: a shell 10 which is provided inside with an orifice part 19 axially penetrating a communication port 19A, has communication ports 11, 12 opened at both ends and extends on a straight line; a plunger 20 housed reciprocatably in the axial direction of the shell 10 along the inner peripheral surface of the shell 10 between the orifice part 19 and one communication port 12; a valve element 30 situated between the orifice part 19 and the plunger 20 and reciprocating in conjunction with the plunger 20 in the axial direction of the shell 10; a spring 40 imparting elastic force in one axial direction of the shell 10 to the plunger 20; a coil 60 wound along the outer peripheral surface of the shell 10 and, when energized, making magnetic force act on the plunger in an opposite direction to the direction of the elastic force imparted by the spring 40; and a yoke 80 forming a magnetic circuit outside the shell 10 when the coil 60 is energized.

Description

  The present invention relates to an electromagnetically driven valve.

  Patent Document 1 discloses a conventional electromagnetically driven valve. This electromagnetically driven valve includes a pipe body, a plunger, a valve body, a spring, a coil, a yoke, and a plate. The pipe body is provided with an orifice portion in which a flow port penetrates in the axial direction and extends in a straight line, and communication ports are opened at both ends. The plunger is cylindrical and forms a flow path through which fluid flows. The plunger is accommodated in the tube body from one communication port, and can reciprocate in the axial direction of the tube body with one end portion protruding from the one communication port of the tube body. The valve body has a spherical shape, is positioned between the orifice portion and the plunger, and can reciprocate in the axial direction of the tubular body in conjunction with the reciprocation of the plunger. The spring is sandwiched between the plunger and the plate, and gives an elastic force to the plunger in the direction of moving toward the orifice portion.

  The coil is surrounded by a spool. The spool surrounding the coil is cylindrical. The spool interpolates part of the tube. For this reason, the coil is in a state of being wound along the outer peripheral surface of the tubular body. One communication port of the tubular body is located inside the one end surface of the spool. The yoke is composed of a substantially cylindrical peripheral surface part partially cut away in the axial direction of the tubular body, and an end surface part having an insertion hole extending inwardly from one end of the peripheral surface part and inserting the tubular body Has been. The other open end of the peripheral surface portion is flush with one end surface of the spool. The inner peripheral surface of the peripheral surface portion is in contact with the outer peripheral surface of the spool. The insertion hole in the end surface portion is in contact with the outer peripheral surface of the tubular body. The plate is a disk-shaped flat plate, and an opening smaller than the inner diameter of the plunger is provided through the central portion. The back surface of the plate is in contact with one end surface of the spool and the other end portion of the peripheral surface portion of the yoke.

  When this coil is energized, magnetic flux is generated in the magnetic circuit passing through the plate, yoke, tube, and plunger, and the plunger moves toward the plate by the magnetic force. Thus, since the plunger moves toward the plate by the magnetic force, the electromagnetically driven valve forms a gap between the one communication port of the tubular body and the plate. Thereby, this electromagnetically driven valve can move a plunger reliably by magnetic force, and a valve body can open a flow port and can be in a valve open state. Further, in this electromagnetically driven valve, when energization to the coil is interrupted, the magnetic flux disappears and the compressed spring extends, so that the plunger moves toward the orifice portion. Thus, the electromagnetically driven valve can be closed by the valve body closing the flow port.

JP-A-5-296363

  However, since the electromagnetically driven valve of Patent Document 1 forms a gap between one communicating port of the pipe body and the plate, the pipe body and the fluid are prevented from leaking through the gap. It is necessary to provide a seal structure between the spool and between the spool and the plate. Therefore, this electromagnetically driven valve may have a complicated structure, or fluid may leak if the sealing performance of the sealing structure is insufficient.

  The present invention has been made in view of the above-described conventional situation, and an object to be solved is to provide an electromagnetically driven valve that can prevent fluid leakage with a simple structure.

In the electromagnetically driven valve of the present invention, an orifice portion having an axially penetrating flow port is provided inside, a communicating port is opened at both ends, and a tubular body extending in a straight line;
A plunger accommodated so as to be reciprocally movable in the axial direction of the tubular body along the inner peripheral surface of the tubular body between the orifice portion and one of the communication ports;
A valve body that is located between the orifice portion and the plunger and reciprocates in the axial direction of the tube body in conjunction with the reciprocating movement of the plunger;
A spring that is housed in the tubular body and applies an elastic force in one axial direction of the tubular body to the plunger;
A coil that is wound along the outer peripheral surface of the tubular body, and that applies a magnetic force in a direction opposite to the direction of the elastic force applied by the spring to the plunger when energized;
And a yoke that constitutes a magnetic circuit outside the tubular body when the coil is energized.

  This electromagnetically driven valve does not require a sealing structure because the flow path between the communication ports at both ends is formed by a single tube. And this electromagnetically driven valve has a plunger and a valve body in the axial direction along the inner peripheral surface of the tube body by the magnetic force generated by energizing the coil arranged outside the tube body and the elastic force of the spring. It can be reciprocated and fluid can be circulated in the tube.

  Therefore, the electromagnetically driven valve of the present invention can prevent fluid leakage with a simple structure.

FIG. 2 is a cross-sectional view illustrating the on-off valve of the first embodiment and showing a closed state. FIG. 3 is a cross-sectional view illustrating the open / close valve of the first embodiment. It is a proportional valve of Example 2, Comprising: It is sectional drawing which shows a valve closing state. It is a proportional valve of Example 2, Comprising: It is sectional drawing which shows an intermediate valve opening state. It is a proportional valve of Example 2, Comprising: It is sectional drawing which shows a valve open state. FIG. 6 is a cross-sectional view showing a double open / close valve according to a third embodiment.

  A preferred embodiment of the present invention will be described.

  In the electromagnetically driven valve according to the present invention, the plunger may be a cylinder having a flow path through which a fluid flows. In this case, in this electromagnetically driven valve, the inner peripheral surface of the tubular body serves as a guide for the plunger, and the plunger can be smoothly reciprocated along the inner peripheral surface of the tubular body. In addition, this electromagnetically driven valve can increase the flow rate of the fluid flowing in the pipe body as compared with the one in which the fluid flows around the plunger.

  The electromagnetically driven valve according to the present invention may be provided with a core that is fixed in the tube, forms a magnetic circuit when the coil is energized, and has a through hole through which a fluid flows in the center. In this case, the electromagnetically driven valve is provided with a core, so that when the coil is energized, the magnetic flux density between the core and the plunger is increased, and the plunger can be reliably moved by the magnetic force. The jar can be securely held in place.

  In the electromagnetically driven valve according to the present invention, the plunger may have a support portion that supports the valve body at one end. In this case, the valve body can be reliably interlocked with the reciprocating movement of the plunger by connecting the valve body to the plunger via the support portion.

  Next, Examples 1 to 3 embodying the electromagnetically driven valve of the present invention will be described with reference to the drawings.

<Example 1>
As shown in FIGS. 1 and 2, the electromagnetically driven valve according to the first embodiment is an on-off valve. The on-off valve includes a pipe body 10, a connecting pipe 15, a plunger 20, a valve body 30, a spring 40, a core 50, a coil 60, a spool 70, and a yoke 80.

  The tubular body 10 is formed by press-molding a non-magnetic metal plate. The tubular body 10 has a first communication port 11 and a second communication port 12 which are communication ports at both ends, and extends in a straight line. The tube body 10 includes a first tube portion 13 and a second tube portion 14. The first tube portion 13 is a circular tube in which the first communication port 11 is formed at an end portion (the upper end portion in FIG. 1). The second pipe portion 14 is continuous to the step portion 13A bent outward from the end portion (the lower end portion in FIG. 1) of the first pipe portion 13, and has a larger diameter than the first pipe portion 13. It is a circular pipe. The end portion of the second pipe portion 14 (the lower end portion in FIG. 1) is an inclined portion 14A that gradually expands outward, a flange portion 14B that extends outward from the end portion of the inclined portion 14A, and a flange portion. 14 </ b> B has a folded portion 14 </ b> C folded along the second pipe portion 14 from the outer peripheral edge portion of 14 </ b> B. The end portion of the second tube portion 14 formed in this way forms the second communication port 12 of the tube body 10. The first pipe portion 13 has a first recess 13 </ b> B in which a predetermined same circumference close to the first communication port 11 is recessed inward. The 2nd pipe part 14 has 2nd recessed part 14D which dented inside the predetermined same circumference close | similar to a step part inside.

  The tube body 10 has a connecting tube 15 inserted into the first communication port 11. The connecting tube 15 is also formed by press-molding a nonmagnetic metal plate. The connecting pipe 15 includes a first connecting pipe part 16, a second connecting pipe part 17, a third connecting pipe part 18, and an orifice part 19. The first connecting pipe part 16 is a circular pipe having the same diameter as the second pipe part 14 of the tubular body 10. One end portion (the upper end portion in FIG. 1) of the first connecting pipe portion 16 has an inclined portion 16A that gradually expands outward, and a flange portion 16B that extends outward from the end portion of the inclined portion 16A, It has a folded portion 16C that is folded along the first connecting pipe portion 16 from the outer peripheral edge portion of the flange portion 16B. That is, one end portion of the first connecting tube portion 16 has the same form as the end portion of the second tube portion 14 of the tube body 10. The second connecting pipe portion 17 is continuous with the step portion 16D bent inward from the end portion (the lower end portion in FIG. 1) of the first connecting pipe portion 16, and the first pipe portion of the tubular body 10. A circular tube having an outer diameter slightly smaller than the inner diameter of 13. The third connecting pipe portion 18 is continuous with the stepped portion 17A bent inward from the end portion (the lower end portion in FIG. 1) of the second connecting pipe portion 17, and is more than the second connecting pipe portion 17. A circular tube with a small diameter. The orifice portion 19 extends inwardly from an end portion (lower end portion in FIG. 1) of the third connecting pipe portion 18 and has a circulation port 19A penetrating through the center portion.

  The second connecting pipe part 17, the third connecting pipe part 18, and the orifice part 19 of the connecting pipe 15 are inserted into the first pipe part 13 of the tube body 10. One O-ring 18 </ b> A and one backup ring 18 </ b> B are extrapolated to the third connecting pipe portion 18. The O-ring 18 </ b> A is sandwiched between the outer peripheral surface of the third connecting pipe portion 18 and the inner peripheral surface of the first pipe portion 13. Further, the outer peripheral surface of the second connecting pipe portion 17 and the inner peripheral surface of the first pipe portion 13 are laser-welded. For this reason, the sealing performance of the connecting portion between the tube body 10 and the connecting tube 15 is firmly maintained. Further, by connecting the connecting pipe 15 to the tube body 10, an orifice portion 19 having an axially penetrating opening is provided inside the tube body 10.

  The plunger 20 is made of a magnetic material. The plunger 20 is fixed between the orifice portion 19 and the second communication port 12, more specifically, the orifice 50 and the core 50 fixed to the end portion (the upper end portion in FIG. 1) of the second pipe portion 14. It is stored between. The plunger 20 is a cylindrical body having a flow path 21 through which a fluid flows. The plunger 20 has an outer diameter slightly smaller than the inner diameter of the first tube portion 13 of the tube body 10. The plunger 20 housed in the first pipe part 13 is reciprocated in the axial direction of the tube body 10 along the inner peripheral surface of the first pipe part 13 with the inner peripheral surface of the first pipe part 13 serving as a guide. Can move. The plunger 20 has an inclined surface 22 whose outer peripheral surface is inclined so that the outer shape is gradually reduced in diameter at the end on the core 50 side.

  The plunger 20 has a support portion 23 made of stainless steel that supports the valve body 30 at the end on the orifice portion 19 side. The support portion 23 is a flat plate-like first annular portion 24 fixed to one end of the plunger 20 and a flat plate-like connection extending inward from a position 90 degrees away from the inner peripheral edge of the first annular portion 24. The part 25 and the edge part inside the connection part 25 are formed from the flat 2nd ring part 26 connected to the outer periphery. A fluid flowing in the tubular body 10 can flow through the space X provided between the first annular portion 24 and the second annular portion 26 and between the connecting portions 25.

  The valve body 30 includes a valve main body 31 and a valve shaft 32. The valve shaft 32 is made of stainless steel, and has a cylindrical central portion 33 having an outer diameter substantially equal to the outer diameter of the second annular portion 26 of the support portion 23 of the plunger 20, and one end portion of the central portion 33. A columnar mounting portion 34 extending from the center of the lower end portion (in FIG. 1) and the outer peripheral edge of the other end portion (upper end portion in FIG. 1) of the central portion 33 extended outward. And a flange 35. The end surface of the valve shaft 32 on the flange 35 side is formed with a slight curved surface so that the center portion protrudes. The attachment portion 34 is inserted into the opening portion 26A opened at the center of the second annular portion 26 of the support portion 23 of the plunger 20, and then the tip is crimped to increase the diameter, and is fixed to the support portion 23 in a retaining state. ing. The valve body 31 is made of rubber and is formed in a disk shape. The valve main body 31 has a recess 31 </ b> A on the back surface side into which the end of the valve shaft 32 where the flange 35 is formed is inserted. The recess 31A is wider on the back side than the insertion port 31B, and the insertion port 31B is formed smaller than the flange portion 35 of the valve shaft 32. For this reason, the valve main body 31 is connected to the valve shaft 32 in a state in which the flange portion 35 is locked to the recess 31A to prevent the valve main body 31 from coming off. Further, since the valve main body 31 is loosely fitted to the valve shaft 32, the valve main body 31 of the valve body 30 can surely abut on the peripheral portion (valve seat) of the flow port 19A of the orifice portion 19, The distribution port 19A can be closed.

  The spring 40 has a coil shape and has an outer diameter slightly smaller than the inner diameter of the plunger 20. The spring 40 is inserted into the flow path 21 of the plunger 20 along the inner peripheral surface of the plunger 20. The spring 40 is sandwiched between the support portion 23 of the plunger 20 and the core 50 fixed to the end portion of the second tube portion 14 of the tube body 10. Therefore, the spring 40 applies an elastic force to the plunger 20 in the direction in which the orifice portion 19 is located (one direction in the axial direction of the tube body 10). In a state where the coil 60 is not energized, the valve body 31 of the valve body 30 abuts on the peripheral portion (valve seat) of the flow port 19A of the orifice portion 19 and closes the flow port 19A by the elastic force of the spring 40. Yes. That is, the on-off valve is in a closed state.

  The core 50 is made of a magnetic material. The core 50 has a substantially annular shape with a flow hole 51 through which fluid flows in the center. The flow hole 51 is formed smaller than the inner diameter of the spring 40. The end of the spring 40 is in contact with the peripheral edge of the flow hole 51. The core 50 is fitted and fixed between a step portion 13A provided at the boundary between the first tube portion 13 and the second tube portion 14 of the tube body 10 and a second recess portion 14D provided in the second tube portion 14. Has been. The core 50 has an annular convex portion 52 formed on the surface facing the plunger 20. The convex portion 52 has an inclined surface 53 on the inner peripheral surface that faces the inclined surface 22 of the plunger 20 when the plunger 20 moves toward the core 50 by magnetic force.

  The spool 70 is made of a nonmagnetic material. The spool 70 includes a cylindrical portion 71 in which the tubular body 10 is inserted, and a first flange portion 72 and a second flange portion 73 that extend outward from both ends of the cylindrical portion 71. The inner peripheral surface of the cylindrical portion 71 is slightly larger than the outer diameter of the first inner peripheral surface portion 71A slightly larger than the outer diameter of the first tube portion 13 of the tube body 10 and the second tube portion 14 of the tube body 10. The second inner peripheral surface portion 71B is formed. The tubular body 10 is inserted into the cylindrical portion 71, and a step portion 71 </ b> C formed at the boundary between the first inner peripheral surface portion 71 </ b> A and the second inner peripheral surface portion 71 </ b> B is connected to the first tubular portion 13 of the tubular body 10. The spool 70 is positioned on the tubular body 10 by being engaged with a stepped portion 13A formed at the boundary with the two tubular portions 14. The coil 60 is wound around a cylindrical portion 71 between the first collar portion 72 and the second collar portion 73 of the spool 70. That is, the coil 60 is wound along the outer peripheral surface of the tubular body 10.

  The yoke 80 is made of a magnetic material. The yoke 80 is formed of a first clamping piece part 81, a second clamping piece part 82, and a side face part 83 that connects the first clamping piece part 81 and the second clamping piece part 82. The first clamping piece portion 81 and the second clamping piece portion 82 are located on both sides in the axial direction of the tubular body 10 with respect to the spool 70 around which the coil 60 is wound. The side portion covers a part of the peripheral surface of the spool 70 around which the coil 60 is wound. The first holding piece 81 has a through hole 81A that passes through the first tube portion 13 of the tube body 10, and the second holding piece 82 has a through hole 82A that passes through the second tube portion 14 of the tube body 10. It is penetrating. The core 50 is disposed inside the through hole 82 </ b> A of the second sandwiching piece 82. In addition, one end of the plunger 20 that reciprocates inside the through hole 81A of the first clamping piece 81 is located. A stopper 84 is attached to the outside of the first clamping piece 81 of the yoke 80 so that the spool 70 around which the yoke 80 and the coil 60 are wound does not move toward the first communication port 11 of the tube body 10.

  In the on-off valve having such a configuration, the second communication port 12 of the tube body 10 is a fluid inflow port, and the opening formed by the first connection tube portion 16 of the connection tube 15 is a fluid outflow port. When this coil 60 is energized, a magnetic flux is formed in the magnetic circuit passing through the yoke 80, the core 50, and the plunger 20, and the plunger 20 causes the pipe 10 to be cored by the magnetic force as shown in FIG. The end of the plunger 20 on the core 50 side comes into contact with the core 50. Since the valve body 30 is connected to the plunger 20 via the support portion 23, the valve body 30 also moves in conjunction with the movement of the plunger 20. As a result, the valve main body 31 of the valve body 30 is separated from the peripheral portion (valve seat) of the flow port 19A of the orifice portion 19, opens the flow port 19A, and the on-off valve is opened. At this time, the plunger 20 moves smoothly with the inner peripheral surface of the first tube portion 13 of the tube body 10 serving as a guide. Moreover, since the fluid flows through the flow path 21 formed inside the plunger 20, the flow rate of the fluid flowing in the tube body 10 can be increased as compared with the fluid flowing around the plunger 20. .

  Moreover, since this on-off valve is provided with the core 50, when the coil 60 is energized, the magnetic flux density between the core 50 and the plunger 20 becomes high, and the plunger 20 can be reliably moved by the magnetic force. At the same time, the plunger 20 can be reliably held at the position where the end on the core 50 side is in contact with the core 50. For this reason, the on-off valve can be opened reliably and the open state can be maintained.

  When the coil 60 is turned off, as shown in FIG. 1, the on / off valve extinguishes the magnetic flux and expands the compressed spring 40, and the plunger 20 moves in the tube body 10 toward the orifice 19. Then, the valve body 31 of the valve body 30 comes into contact with the peripheral portion (valve seat) of the flow port 19A of the orifice portion 19 to close the flow port 19A. That is, the on-off valve is closed. Also at this time, the plunger 20 moves smoothly with the inner peripheral surface of the first tube portion 13 of the tube body 10 serving as a guide.

  Thus, in this on-off valve, since the flow path 21 between the first communication port 11 and the second communication port 12 is formed by one tube body 10, a sealing structure is not required at this portion. The on-off valve has a plunger 20 in the axial direction along the inner peripheral surface of the tubular body 10 by the magnetic force generated by energizing the coil 60 disposed outside the tubular body 10 and the elastic force of the spring 40. And the valve body 30 can be reciprocated, and the fluid can be circulated in the tube body 10.

  Therefore, the on-off valve of the first embodiment can prevent fluid leakage with a simple structure.

<Example 2>
As shown in FIGS. 3 to 5, the electromagnetically driven valve of the second embodiment is a proportional valve. This proportional valve is different from the first embodiment in that the shape of the tip of the valve body 131 of the valve body 130 is a truncated cone shape. Other configurations are the same as those of the first embodiment, and the same configurations are denoted by the same reference numerals and detailed description thereof is omitted.

  In this proportional valve, the second communication port 12 of the tube body 10 is a fluid inflow port, and the opening formed by the first connection tube portion 16 of the connection tube 15 is a fluid outflow port. As shown in FIG. 3, in the proportional valve, when the coil 60 is not energized, the plunger 20 moves in the direction of the orifice portion 19 due to the elastic force of the spring 40, and the tip of the valve body 131 of the valve body 130. The portion is inserted into the flow port of the orifice portion 19, and the inclined surface 131 </ b> A at the tip is in contact with the peripheral portion of the flow port 19 </ b> A of the orifice portion 19. That is, the proportional valve is in a closed state in which the flow port 19 </ b> A is closed by the valve body 131.

  Moreover, this proportional valve can change the movement position of the plunger 20 by controlling the energization to the coil 60. That is, as shown in FIG. 4, this proportional valve is closer to the core 50 than the position of the plunger 20 where the proportional valve is closed, and the end of the plunger 20 on the core 50 side is connected to the core 50. The plunger 20 can be held at any position where it does not contact. In this case, since the valve body 131 of the valve body 130 is held at an arbitrary position overlapping the flow port 19A of the orifice portion 19, the distance between the inclined surface 131A of the valve body 131 and the flow port 19A is adjusted to a small amount. The flow rate of the fluid flowing through the tube 10 can be adjusted to a very small amount. Thus, in this proportional valve, the intermediate valve open state in which a desired flow rate flows, and the end of the plunger 20 on the core 50 side abuts against the core 50 as shown in FIG. The circulation port 19A can be in the fully open state with the most open.

  Also in this proportional valve, since the flow path 21 between the first communication port 11 and the second communication port 12 is formed by a single tube body 10, a seal structure is not required at this portion. The proportional valve is configured so that the plunger 20 is axially moved along the inner peripheral surface of the tubular body 10 by the magnetic force generated by energizing the coil 60 disposed outside the tubular body 10 and the elastic force of the spring 40. The valve body 130 can be reciprocated, and the fluid can be circulated in the tube body 10 at a desired flow rate.

  Therefore, the proportional valve of Embodiment 2 can also prevent fluid leakage with a simple structure.

<Example 3>
As shown in FIG. 6, the electromagnetically driven valve according to the third embodiment is a double open / close valve. The first and second on-off valves 201 and 202 differ from the first embodiment in that the first on-off valve 201 and the second on-off valve 202 are provided in series with respect to the pipe body 210 having communication ports 211 and 212 at both ends. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The tube body 210 is formed by press-molding a non-magnetic metal plate. The tube body 210 has a first communication port 211 and a second communication port 212 that are communication ports at both ends, and extends in a straight line. The tube body 210 includes a first tube portion 213 and a second tube portion 214. The first pipe portion 213 is a circular pipe having the first communication port 211 formed at the end (the upper end in FIG. 6), and the first on-off valve 201 and the second on-off valve 202 can be provided in series. It has a length. The second pipe part 214 is continuous with the step part 213A bent outward from the end part (the lower end part in FIG. 6) of the first pipe part 213, and has a larger diameter than the first pipe part 213. It is a circular pipe. The first tube portion 213 is recessed inwardly on the same circumference at a predetermined position near the second tube portion 214, and the first recess portion 213B recessed inwardly on the same periphery at a predetermined position in the intermediate portion. And a second recess 213C.

  The first on-off valve 201 and the second on-off valve 202 include a core of the first on-off valve 201 (the upper on-off valve in FIG. 6) and an orifice of the second on-off valve 202 (the lower on-off valve in FIG. 6). The insertion member 203 is formed integrally with the part. The insertion member 203 is made of a magnetic material. The insertion member 203 is a cylindrical body having an outer diameter slightly smaller than the inner diameter of the first pipe portion 213 of the tube body 210 and having a flow path 203A through which fluid flows. The insertion member 203 has recesses 204 and 205 formed on two identical circumferences separated by an outer peripheral surface. One recess 204 is fitted with an O-ring 204A. The other recess 205 is fitted with a first recess 213 </ b> B provided in an intermediate portion of the first tube portion 213, whereby the insertion member 203 is entirely inserted into the first tube portion 213 of the tube body 210. It is fixed in the state.

  The insertion member 203 has an annular convex portion 206 formed on the peripheral portion of the surface of the first opening / closing valve 201 facing the plunger 20. The convex portion 206 forms an inclined surface 207 on the inner peripheral surface that faces the inclined surface 22 of the plunger 20 when the plunger 20 of the first on-off valve 201 moves to the insertion member 203 side by magnetic force. A magnetic circuit of the first on-off valve 201 is configured between the insertion member 203 and the plunger 20 of the first on-off valve 201. Further, when the valve body 31 of the valve body 30 of the second on-off valve 202 abuts on the insertion member 203, the flow path 203A is closed, the second on-off valve 202 is closed, and the second on-off valve 202 is closed. When the valve body 31 of the valve body 30 is separated from the insertion member 203, the second on-off valve 202 is opened.

  The core 250 of the second on-off valve 202 is made of a magnetic material. The core 250 is a cylindrical body having an outer diameter slightly smaller than the inner diameter of the first pipe portion 213 of the pipe body 210 and having a flow path 251 through which a fluid flows. The core 250 has a recess 254 formed on the same circumference of the outer peripheral surface. The concave portion 254 is fitted with a second concave portion 213 </ b> C provided in the first pipe portion 213, whereby the core 250 is fixed in the first pipe portion 213. The core 250 has an annular convex portion 252 formed on the peripheral edge of the surface of the second opening / closing valve 202 facing the plunger 20. The convex portion 252 forms an inclined surface 253 on the inner peripheral surface that faces the inclined surface 22 of the plunger 20 when the plunger 20 of the second on-off valve 202 moves to the core side by magnetic force.

  In the two on-off valves having such a configuration, when the first on-off valve 201 and the second on-off valve 202 are energized to each coil 60, the magnetic force passing through the yoke 80, the insertion member 203 or the core 250, and the plunger 20. Magnetic flux is formed in the circuit, and each plunger 20 moves in the tube body 210 in the direction of the insertion member 203 or the core 250 by the magnetic force, and the end of each plunger 20 on the insertion member 203 or core 250 side is the insertion member 203. Or it contacts the core 250. Since each valve body 30 is connected to each plunger 20 via the support portion 23, each valve body 30 also moves in conjunction with the movement of each plunger 20. As a result, in the first on-off valve 201, the valve main body 31 is separated from the peripheral portion (valve seat) of the flow port 19A of the orifice portion 19, and the flow port 19A is opened, so that the first on-off valve 201 is opened. In the second on-off valve 202 as well, the valve main body 31 is separated from the peripheral portion (valve seat) of the flow path 203A of the insertion member 203, opens the flow path 203A, and the second on-off valve 202 is opened. At this time, each plunger 20 moves smoothly with the inner peripheral surface of the first pipe portion 213 serving as a guide. Further, since the fluid flows through the flow path 21 formed inside each plunger 20 that is a cylindrical body, the flow rate of the fluid flowing in the tube body 210 compared to the fluid flowing around each plunger 20. Can be more.

  Moreover, since the 1st on-off valve 201 is provided with the insertion member 203 equivalent to a core, and the 2nd on-off valve 202 is provided with the core 250, the magnetic flux density between the insertion member 203 or the core 250, and each plunger 20 is provided. The plunger 20 can be reliably moved by the magnetic force, and each plunger 20 can be reliably held at a position where it abuts against the insertion member 203 or the core 250. For this reason, the 1st on-off valve 201 and the 2nd on-off valve 202 can open reliably, and can maintain a valve opening state.

  When the coil 60 is turned off, the first on-off valve 201 and the second on-off valve 202 extinguish the magnetic flux and the compressed springs 40 extend, and the plungers 20 and the valve bodies 30 are in the pipe body 210. Is moved in the direction of the orifice 19 or the insertion member 203. As a result, in the first on-off valve 201, the valve main body 31 comes into contact with the peripheral portion (valve seat) of the flow port 19A of the orifice portion 19, closes the flow port 19A, and is in a closed state. In the second on-off valve 202 as well, the valve main body 31 comes into contact with the peripheral portion (valve seat) of the flow path 203A of the insertion member 203, closes the flow path 203A, and enters a closed state. Also at this time, each plunger 20 moves smoothly with the inner peripheral surface of the first pipe portion 213 serving as a guide.

  As described above, in the two open / close valves, the flow path between the first communication port 211 and the second communication port 212 is formed by a single tube, and therefore, a seal structure is not required at this portion. . The two on-off valves are arranged along the inner peripheral surface of the tube body 210 by the magnetic force generated by energizing the coils 60 arranged outside the tube body 210 and the elastic force of the springs 40. Each plunger 20 and each valve body 30 can be reciprocated in the direction, and fluid can be circulated in the tube body 210.

  Therefore, the double open / close valve of the third embodiment can also prevent fluid leakage with a simple structure.

The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In Examples 1 to 3, the plunger is a cylinder, but the plunger may be cylindrical. In this case, fluid flows around the plunger in the tube.
(2) In Examples 1 to 3, the core is provided, but the core may not be provided. In this case, it is preferable to change the shape of the yoke outside the tube so that the magnetic circuit is formed satisfactorily.
(3) In the first to third embodiments, the plunger is provided with the support portion to support the valve body, but the valve body may be provided integrally with the plunger.
(4) In the first to third embodiments, the orifice portion is formed by a connecting pipe that is partially inserted into the tubular body and partially exposed. However, like the insertion member of the third embodiment, the entire inside of the tubular body is formed. The orifice portion may be formed by a member into which is inserted.
(5) In Examples 1 to 3, the tubular body and the connecting pipe are formed by press-molding a non-magnetic metal plate, but the tubular body and the connecting pipe may be formed by other methods.

  The present invention can be used for an on-off valve provided in a gas flow path of fuel gas or reformed gas of a fuel cell.

10, 210 ... Tube 11, 12, 211, 212 ... Communication port (11, 211 ... First communication port, 12, 212 ... Second communication port)
DESCRIPTION OF SYMBOLS 19 ... Orifice part 19A ... Distribution port 20 ... Plunger 23 ... Support part 30, 130 ... Valve body 40 ... Spring 50, 250 ... Core 60 ... Coil 80 ... Yoke

Claims (4)

An orifice having an axially penetrating opening is provided inside, a communicating opening is opened at both ends, and a tubular body extending in a straight line;
A plunger accommodated so as to be reciprocally movable in the axial direction of the tubular body along the inner peripheral surface of the tubular body between the orifice portion and one of the communication ports;
A valve body that is located between the orifice portion and the plunger and reciprocates in the axial direction of the tube body in conjunction with the reciprocating movement of the plunger;
A spring that is housed in the tubular body and applies an elastic force in one axial direction of the tubular body to the plunger;
A coil that is wound along the outer peripheral surface of the tubular body, and that applies a magnetic force in a direction opposite to the direction of the elastic force applied by the spring to the plunger when energized;
An electromagnetically driven valve comprising: a yoke that forms a magnetic circuit outside the tubular body when the coil is energized.   The electromagnetically driven valve according to claim 1, wherein the plunger is a cylindrical body having a flow path through which fluid flows.   3. The electromagnetic wave according to claim 1, further comprising: a core that is fixed in the pipe body, constitutes a magnetic circuit when the coil is energized, and has a through hole through which a fluid flows in the center. Drive valve.   The electromagnetically driven valve according to any one of claims 1 to 3, wherein the plunger has a support portion that supports the valve body at one end portion.

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